How do you guys determine if a plant is either overwatered or underwatered? Any tricks to notice the difference easier?

They have both droopy leaves but the overwatered plant have moist soil and the underwatered plant have dry soil. The surface can be dry while the area around the roots is moist so the tips is to put your finger in the soil deeper enough to see if the first 5 cm are dry or moist , you can go deeper but 5cm or deeper you need to be carefull and not damage the roots. The pot weight is to me the best way to know if it's an over or under watering because a wet pot is always heavier than a dry pot. So before watering check the weight by lifting the pot , do the same after watering , now you need to wait until the pot have the same weight than before watering to water again